The tweecer is really neat because you can switch between up to 4 tunes, plus the stock tune. So I can literally run any mixture I want and just flip the switch. Generally, I have one for the summer blend (up to 90% ethanol), one for the winter blend (around 70% for better cold weather starting), a half tank mix (around 40-50%) and the 87 octane tune.
Hey man so i was doing some reading on possibly using e85 as an alternative fuel or an additive to my fuel and had a few questions if you could help me. The tweecer programmer that you are mentioning allows the car to adjust the timing relying only on the ECU? Or is there other modifcations you have to make? I was also reading that generally cars not designed to run e85 usually average a difference of up to 20-30% difference in MPG. This would mean that i would have to be able to buy this fuel for 20% cheaper than gas to be effective. Do you know about how many miles per gallon difference you noticed when you switched? I have a 04 4.6l not sure if you have the same motor or not. Last question, suppose i was to get a permit and start making this fuel at my home, would it be beneficial, in you opinion, to create a mixture that contains 70% gas and 30% ethanol or something like that. I am trying to find a ratio that would allow me to use the stock tune and still help me save gas money. Thanks for the help!
The tweecer is just a tuner which plugs into the factory computer and allows you to modify the factory tune with your laptop: The TwEECer -- EEC-IV user programmable module
I pretty much left my timing tables the same, just adding a few degrees to take advantage of the higher octane (as you would for 91), and changed the injector slopes to trick the computer into thinking it was still running gasoline. I would think nearly any tuner would allow you to do that, I just happen to own a tweecer.
I haven't found my gas mileage to take as significant of a nose dive as the energy content would suggest. As I said above, the ethanol promotes a more complete burn to improve efficiency, and of course has a higher octane allowing for higher CRs to recover efficiency. On gasoline, I was usually around 21.something on my normal drive and on E85, I found I was around 19.5-20mpg. I guess that is a change of somewhere between 5-10%, but I must admit I am at WOT more while running E85.
As for mixtures... I saw a technical paper (SAE I think) once which looked at the gas mileage of E10, E20 and E30 mixtures on many different cars. The conclusion was that you generally don't loose and gas mileage on mixtures up to 20%, which they said was due to the more complete burn which the ethanol promotes. Interestingly, some cars gained a little mileage on these mixtures, even to 30%. So it kinda pisses me off when I see people shouting their mouth off about loosing gas mileage on the 10% ethanol gas which is standard these days. Clearly ignorant.
Great info man, thanks a lot. I'm gonna do a bit more research on it, anything that saves me a few bucks will be great. I am confused as to what you mean by changing the injector slopes, I think its from tuning and not a literal physical change? Also a noob as to what WOT means but ill look it up haha. Thanks for the help dude. Who knows in a couple of weeks i might be making white lightning in my backyard! lol
i bought my 97 stang used and it runs on e -85 and ive been running it almost a year no probs likes wot and ive hammered it alot daily driverit eats O rings and will def cause problems after a year of straight use. The new cars that are dual fuel have synthetic based poly's
also the spark plugs are always clean with the e-85 at least in my casei bought my 97 stang used and it runs on e -85 and ive been running it almost a year no probs likes wot and ive hammered it alot daily driver
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